[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 5d8eede Move Py_buffer_RAII to .h file so SWIG 2 doesnt have to parse it
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   5d8eede..93af370  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 93af37043b9c1a8ea47890ad2bcf277f9b36c47d.
CMake Error at CMakeLists.txt:3 (cmake_minimum_required):
  CMake 3.13.4 or higher is required.  You are running version 3.7.1


-- Configuring incomplete, errors occurred!